1217420917 has 2 divisors, whose sum is σ = 1217420918. Its totient is φ = 1217420916.

The previous prime is 1217420909. The next prime is 1217420969. The reversal of 1217420917 is 7190247121.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 933363601 + 284057316 = 30551^2 + 16854^2 .

It is a cyclic number.

It is not a de Polignac number, because 1217420917 - 2³ = 1217420909 is a prime.

It is a super-2 number, since 2×1217420917² = 2964227378298241778, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1217420987) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 608710458 + 608710459.

It is an arithmetic number, because the mean of its divisors is an integer number (608710459).

Almost surely, 2^1217420917 is an apocalyptic number.

It is an amenable number.

1217420917 is a deficient number, since it is larger than the sum of its proper divisors (1).

1217420917 is an equidigital number, since it uses as much as digits as its factorization.

1217420917 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7056, while the sum is 34.

The square root of 1217420917 is about 34891.5593947877. The cubic root of 1217420917 is about 1067.7762407807.

The spelling of 1217420917 in words is "one billion, two hundred seventeen million, four hundred twenty thousand, nine hundred seventeen".